14. When did cyanobacteria start producing pure oxygen?
O A. After the Hadean eon
O B. During...
Geography, 25.02.2021 14:00 jaylabazemore
14. When did cyanobacteria start producing pure oxygen?
O A. After the Hadean eon
O B. During the Hadean eon
O C. After the Proterozoic eon
O D. During the Phanerozoic eon
Answers: 3
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In a scientific experiment, a is any factor that can be changed or be changed
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What can you learn about precipitation levels in south america from this map? brazil is experiencing a drought.it rains more in higher altitudes.peru received the highest level of rain.venezuela got less than 25 cm of rain.
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Select the correct answer.look at this nineteenth-century illustration of london. which explanation best relates this illustration to changes in britain in the 1800s? a.factory workers in cities lost their livelihood because of the lack of housingb.industrialization narrowed the inccome gap between landowners and workers.c.the migration of workers from rural to urban areas resulted in overcrowded citiesd.the spread of railways allowed farmers to sell produce far from where it was grown.
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